Making backing member for slitting machines



Mar ch 25, 1930. 1 CAMERON 1,752,061

INVENT ATT EY Patented Mar. 25, 1930 'UNETED STATES PATENT OFFEQE JAMES A. CAMERON, 0F BROOKLYN, NEW YORK, ASSIGNOR TO CAMERON MACHINE COMPANY, OF BROOKLYN, NEW YORK, A CORPORATION OF NEW YORK IEAKING- BACKING MELIIBER FOR SLITTING MACHINES Application filed May 25, 1928. Serial No. 280,516.

This invention relates to a method of making a backing member for a slitting machine such as is disclosed in application Ser. No. 332,037, filed January 12, 1929.

Machines for slitting webs of flexible material are now required to act on Webs of very considerable width, and in machines that employ the score-cut method (involving the use of a smooth-face glass-hard backing member and a blunt cutting member) the weight and length of the backing member present unusual difliculties not only in the process of manufacturing such member but also in maintaining the proper running'bah ance at high speeds,this, quite aside from the question of expense.

The main object and feature of this invention is to devise a method of producing a backing member that, while possessing the requisite rigidity and hardness, will nevertheless be of less weight, easier to make and cheaper to manufacture than backing members now employed in this type of machine.

In the accompanying drawings the invention is disclosed in several concrete and preferred forms in which:

Fig. 1 is a diagrammatic view showing the step of bending a flat blank of sheet material into circular form.

Fig. 2 is a sectional view substantially on the plane of line 2-2 of Fig. 3 showing the curved blank of Fig. 1 in position on a man drel during the step of welding the free ends thereof to produce a sleeve.

Fig. 3 is a sectional view substantially on the plane of line 33 of Fig. 2.

Fig. 4 is a diagrammatic view of a crucible to denote the steps of hardening the blank.

Fig. 5 is a view similar to Fig. 2 but showing the step of grinding the outside of the sleeve.

Fig. 6 is a diagrammatic view showing the step of grinding the inside of the sleeve. 7

Fig. 7 shows the sleeve mounted on a core of softer material than itself.

Fig. 8 is a diagrammatic View showing a fiat blank of sheet metal drawn up into cupshape.

In brief, the process consists of converting a flat blank of sheet'metal into a sleeve, then hardening said sleeve, then grinding said sleeve inside and outside, and then mountmg said sleeve on a core of softer material than itself. The steps for carrying out this process may vary but a preferred method is shown in Figs. 1 to 7 inclusive. As there shown, a flat blank 1 of sheet metal, is ul jocted to the action of rollers 2 to bend it into circular form. The blank so produced 1 now be placed upon a collapsible mend and held in place by clamping bands 4 ed to be tightened by adjustable The action here is that the free e curved blank are brought, preferec butting engagement and are then we electric welding or otherwise. lifter weld has been made, the mandrel is collaised in a well-understood manner and the sleeve is removed. Fig. 4 shows the step of hardening the sleeve. This is represented here by the representation of crucible 6 and will, of course, vary in accordance with the characte' of the material acted upon and the degree 1 hardness desired. One method is to place sleeve 1 in crucible 6, provided witn cover 7. and to Carbonize it and cool it. After this, sleeve 1 is again heated and may be quenched in oil, brine or plain water. Sleeve 1 is new again mounted on a mandrel as 8 (P and subjected to the action of grindi ole ment 9 that grinds the outside of the The sleeve thus ground on its outside placed in workholder 10 6) and s is subjected to the action of grind ment 11 that grinds the interior of the s-;..eeve. The sleeve thus finished can now bi upon acore 12 (Fig. 7) softer thanits .1 it will be understood that any number sleeves as 1 can be placed upon such core member. Preferably sleeve 1 is rotatable on the core.

By the foregoing method it will be evident, that the weight of the parts of the slitting machine are reduced and the process of manufacture is less expensive than heretofore, and that this can be done ivitaout sacrificing strength or qualities of l: r-rdness.

In Figs. 8 and 9 is shown an alternate form of a method of converting a flat blank of sheet metal into sleeve form. As there shown a flat blank is placed in a drawing press, the plunger of which latter is indicated at 13, and the blank is drawn into a cup-shape blank 14. This blank is then trimmed to produce a sleeve 1 by means of shears or cut- 7 ting members as will be understood. The remaining steps of the process may then be as previously described in connection with Figs. 2, 3, 4, 5, 6 and 7.

I claim 1. The method of making a backing mem- V ber for a slitting machine which consists in converting a fiat blank of sheet metal into a sleeve, then hardening said sleeve, then grinding said sleeve inside and outside, and then mounting said sleeve on a core of softer material than itself.

2. The method of making a backing memher for a slitting machine which consists in drawing a fiat blank of sheet metal into cupshape form, then trimming the drawn blank to produce a sleeve, then hardening the sleeve, then grinding said sleeve inside and outside, and then mounting the sleeve on a core of softer material than itself.

3. The method of making a baoking memher for a slitting machine which consists in converting by bending a flat blank of sheet metal into sleeve form, then hardening said sleeve, then grinding said sleeve inside and outside, and then mounting said sleeve on a core of softer material than itself.

Signed at the borough of Brooklyn, in the county of Kings, city and State of New York,

this 21 day of May, 1928.

JAMES A. CAMERON. 

